Sorry, I was trying to explain why there are so many contributors on this document. I am not so much into the details but I can try to explain a little bit mor

Sorry, I was trying to explain why there are so many contributors on this document. I am not so much into the details but I can try to explain a little bit more. First of all is important to understand the time scope of the project. The whole FCC is suppose to run until the end of the 21st century and one way or another will shape the general knowledge of us as human. Then, it is a CERN project, so it's CERN that decided whenever this get build or not. CERN has it's own budget and decide what to do with it. Of course, the project is so big, that is expected some level of (at least general) agreement between the member state of CERN. Given the context, the document aim to create a general understanding of what will be FCC, what will be its cost, what the benefits and what the challenges. Nothing is yet, set on stones, but it is a first high level sketch of the project. In my understanding the target of the document are the people that decide what to do with the CERN budget, which are generally ex-physisct, with a deep understanding of the matter, but that now are into management. They will need to manage the balance between costs, opportunities and expected reward of the project. They will need to decide if it is actually worth to build it or not. Unfortunately I cannot speak about physics, I am an engineer who happens to work at CERN. However the general model at CERN is been to build a "small" accelerator to discover new things and a new bigger one to measure this new thing. LHC is the small one that discovered Highs. More precise measurements will required something bigger. Given this context, my understanding is that particle physics is a little in a tough spot. Everything seems to work kind of alright, but there are few points not well understood or predicted. It is not like we have no idea of what is happening, but we are not even super super sure of everything. Interesting to know that there is another project "competitor" of FCC, CLIC which is a linear accelerator and in my understanding should explore a different space of the problem. Given all this, sorry that I cannot comment on the physics, but if there is enough interest in the community we can try to get in touch with somebody more informed than me on both the physics and the technology side. If you guys have more questions please ask, and I will try to do my best...